Answers
1. Venules
2. Veins
3. Inferior vena cava & superior vena cava
4. Right atrium
5. Tricuspid valve
6. Right Ventricle
7. Pulmonary semilunar valve
8. Pulmonary arteries
9. Lungs
10. Pulmonary veins
11. Left atrium
12. Mitral valve
13. Left ventricle
14. Aortic semilunar valve
15. Aorta
16. Arteries
17. Arterioles
18. Capillaries
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